Why are NoSQL database interesting?

• a. Application development productivity
• b. Large scale data

What are categories of NoSQL database?

• a. Key Value {i.e. Riak, Redis, Memcached}
• b. Document {i.e. MongoDB, CouchDB}
• c. Column Family {i.e. Cassandra, HBase, Amazon SimpleDB}
• d. Graph {i.e. Neo4J}

What are common NoSQL database feature?

• a. NoSQL database are designed to run on Clusters.
• b. NoSQL database work without schema, also accept any change on structure of data.
• c. NoSQL database are not a replacement of Relational Database.
• d. Most of NoSQL are open source.

What do you mean by Aggregates of data?